[ArthurDent]

Hi,

I cannot not get any digital sound playback with my Turtle Beach Micro II USB Sound Card. I read everywhere that this card more or less works out of the box with digital passthrough, so I am obviously doing sth very stupid here.

My setup:
Shuttle XS35GT V2, XBMC Live 10.1, Kernel 2.6.35-25-generic

I use a very short (0.5m) optical cable to connect to my NAD receiver which plays back DD, DTS correctly (tested with other sources to make sure it is not the cable or receiver)

The card seems to be recognized properly:

Code:

aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: Intel [HDA Intel], device 0: STAC92xx Analog [STAC92xx Analog]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 1: default [USB Sound Device        ], device 0: USB Audio [USB Audio]
  Subdevices: 0/1
  Subdevice #0: subdevice #0
card 2: NVidia [HDA NVidia], device 3: NVIDIA HDMI [NVIDIA HDMI]
  Subdevices: 1/1
  Subdevice #0: subdevice #0

I also have an iec958 device:

Code:

aplay -L
<snip/>
default:CARD=default
    USB Sound Device        , USB Audio
    Default Audio Device
<snip/>
iec958:CARD=default,DEV=0
    USB Sound Device        , USB Audio
    IEC958 (S/PDIF) Digital Audio Output

The device shows up in the XBMC audio configuration screen.
I tried (a lot) of settings, the following are the most promising:

Audio output: Optical/Coax
Speaker Configuration 2.0
downmix: off
DD: on
DTS: on
Audio output device: USB Sound Device iec958
Passthrough output device: USB Sound Device iec958

The log looks promising:

Code:

Creating audio device with codec id: 86020, channels: 2, sample rate: 48000, pass-through

However, I do not get any signal on my receiver, but if i remove the optical adapter and plugin analog headphones, I hear digital noise. It is as if the passthrough works, but the device is "stuck" in analog mode and sends the digital signal straight to the analog output

I tried various solutions suggested in this thread, but they did not work:

- commenting out "snd-usb-audio index=-2" in /etc/modprobe.d/alsa-base
- setting pulseaudio to 48Khz output by creating a ~/.pulse/daemon.conf
- Setting the device to custom:"default", this gives an error in the log:

Code:

ERROR: Initialize - failed to open custom device default:AES0=0x6,AES1=0x82,AES2=0x0,AES3=0x2 (error:No such file or directory), retry with default default

I also tried just to play back a surround signal as suggested in the ALSA Digital Out documentation, but I get the same effect: no digital signal at the receiver, but digital noise if i plug in headphones.

Code:

aplay -D iec958:CARD=default,DEV=0 ~/Norrlanda.wav

Thanks in advance, if anyone could give me any pointers on how to go on from here, I would be really, really thankful!

[ArthurDent]

Is anybody out there who successfully uses a Turtle Beach Micro II (not the first version) with digital pass-through? (or simple stereo playback over optical out)

Is there any more information that I should add?

[ysgao]

Try suggestion here

http://forum.xbmc.org/showthread.php?tid=95849

Regards,